Mechanism for making bolts.



P. 4P. DEBDS. MECHANISM FOR MAKING BOLTS. APPLICATION PILED-DBO. 17,1909. 986,697, Patented Mar. 14, 1911.

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UNITED STATES PATENT OFFICE.

FRED F. DEEDS, OF CLEVELAND, OHIO, ASSIGNOR OF ONE-THIRD TO FRANK MCHALE.AND ONE-THIRD 'IO ANTON B. SPURNEY, OF CLEVELAND, OHIO.

IVIECHANISM FOR MAKING BOLTS.

To all whom it may concern:

Be it known that I, FRED F. Danos, a citizen of the United States,residing at Cleveland, in the county of Cuyahoga and State of Ohio, haveinvented certain new and useful Improvements in Mechanism for MakingBolts, of which the following is a speci.- lication.

This invention is a means for making bolts, screws and similar screwthreaded articles, and has for its object to provide improved devicesinvolving the use of shaping and cutting off dies, dies for swaging thethreads on the stock, and dies for finishing the threads by a cuttingaction.

The manner of operating the devices will be apparent from the followingdescription in connection with the accompanying drawings illustratingthe improved means used for producing the articles.

In the accompanying drawings-Figure 1 is a horizontal section of thedies for forming a bolt. Fig. 2 isa section on the line 2 9. of Fig. 1.Fig. 3 is a face view of one of the dies. Fig. 4 is a cross section of apartly completed bolt formed by the dies.

The dies shown as the selected means for producing the articles may beapplied to or adapted for use in various bolt or screw making machines,and in the operation the stock or blank rod l is fed lengthwise betweentwo swaging dies 4 and 4 having opposite semi-circular depressions 4bfor forming and gripping the rod, threads 4a for producing the threadson the bolt, and shaping projections 4c for shaping the end of the boltand assisting in cutting olf the same. When the swaging dies thusdescribed are pressed together on the rod it is clamped and shaped atthe part 5 and the threads are swaged thereon, the projections 4ccutting into the stock to form the tapered point. The diameter betweenthe threaded parts of the dies is a trifle larger than the boltdiameter, to allow for the expansion incident to the impression of thethreads.

The swaging action thus described will produce fins or feathers 5C (seeespecially Fig. 4) extending along the bolt and across the threadsthereof, on opposite sides, incident to the expansion produced by thepressure of the dies, and which cannot well be avoided. These tins areremoved by sliding both of the swaging dies, with the stocktherebetween, in a lateral direction between Speccation of LettersPatent.

Application tiled December 17, 1909.

Patented Mar. 14, 1911.

Serial No. 533,534.

a pair of Xed cutter plates 8 which have straight or parallel threads 8alocated in line with the threads of the swaging dies, which havecomplementary grooves or threads in the sides thereof as indicated at4EL in which the threads 8a travel when the dies are moved laterally,and when the part-s are so moved thv edges of the cutter 8 shear or cutthe fins'. .v from the stock, and at the same time the transverse cutter3, liXed across the space between the cutters 8, cuts off the bolt fromthe remainder of the stock, the bolt passing to the position shown iudotted lines in 1. The head of the bolt must then be formed, and this isdone by a reciprocating die 6, having a concave face. This die is forcedlengthwise against the projecting end of the bolt blank and a head isswaged thereon, as also shown in dotted lines in Fig. 1. The headforming die may have a rib 6a for producing a kerf in the head of thebolt, if desired. Obviously the head may be shaped otherwise. The headdie 6 is then backed off and the swaging dies 4 and 4 slid back tooriginal position and then separated to allow the completed bolt to dropout and to receive the end of the rod for the next bolt. The shearaction of the parts S may form slight flattened portions on the sides ofthe bolt, but this imperfection will be immaterial to ordinary use ofthe bolt. For producing a squareended bolt the projecting portions 4Cofthe swaging dies may be omitted.

I am aware that bolt blanks have been made between swaging dies, and theblanks subsequently worked by cutting or rolling to produce the threadsthereon, thus requiring two operations. The present invention enablesbolts to be produced by a continuous operation, and in one mechanism,and the dies have the further advantage that they may be operated byexisting automatic machines with possibly slight variation of the diemechanism, the particular means for. operating the dies beingimmaterial. The stock to be worked is preferably annealed, and the boltsafterward tempered.

What I claim as new is 1. In a mechanism for making bolts, screws, orthe like, the combination of a pair of thread-swaging dies, and cuttersat opposite sides of the dies, to remove fins produced by the swagingoperation.

2. In a mechanism for making bolts,

Screws, or the like, the combination `of 0pposed clamping and.thread-swagmg dies, and cutter plates at opposite sldes of the f dies,the contacting sides of the dies and cutter plates having complementarystraight threads, and the dies being movable laterally between saidplates, while the bolt blankv is clamped therebetween, to trim `0E thefins produced by the swaging operation.

3. In a mechanism for making bolts, screws, or-the like, `thecombination of opposed'thread-swaging dies, between which the stock isclamped, and ymeans to trim the sides of and cnt olf the bolt blank,while it is so clamped. v y Y 4.111 --a mechanism for making bolts,

screws, or the like, the combination of opposed clamping `and. threadswaging dies,

cut-ters at opposite Sides of said dies for trimming the blank, saiddies being movable laterally between said cutters while the blank isclamped therebetween, a cutting olf -cutterat one end of the dies, andaheader l,Copiesofthispatent may be obtained forvecents eachfbyaddressing. the Commissioner of Patents,

Washington, D. C.

